Hello Sir/Mam,
I understand very well your project's requirement.
I am expert for this type job and me did this kind of project before with 100% satisfaction by client's.
I have attached a sample hopefully it wilLisää

Hey I can do this within 2 hours . I will use the latest server-to-server transfer technology , so that your users don't experience even a second of downtime .
After that I'll only have to change the nameservers .